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Zhe-Wen Li, Jiu-Sheng Li

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    Summary
    This summary is machine-generated.

    This study introduces a switchable metasurface capable of both polarization conversion and filtering. By altering the temperature, the device transitions between these two distinct terahertz wave functionalities.

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    Area of Science:

    • Metasurface technology
    • Terahertz (THz) optics
    • Advanced materials science

    Background:

    • Metasurfaces offer tunable electromagnetic properties.
    • Vanadium dioxide (VO2) exhibits temperature-dependent phase transitions.
    • Multifunctional devices are crucial for advanced THz applications.

    Purpose of the Study:

    • To propose a novel switchable metasurface with dual polarization conversion and filtering functions.
    • To demonstrate the temperature-controlled switching between these functions.
    • To explore the potential for advanced terahertz device design.

    Main Methods:

    • Designing a medium-metal-medium-metal-medium structure incorporating Vanadium Dioxide (VO2).
    • Analyzing terahertz wave interaction with the metasurface at normal incidence.
    • Simulating and characterizing performance in both insulated and metallic states of VO2.

    Main Results:

    • Achieved high polarization conversion rate (>93%) from 2.01 to 2.86 THz in the insulated state.
    • Demonstrated broadband band-stop filtering with a 1.73 THz 3 dB bandwidth in the metallic state.
    • Confirmed switchable functionality between polarization conversion and filtering via temperature control.

    Conclusions:

    • The proposed VO2-embedded metasurface successfully integrates polarization conversion and filtering.
    • Temperature-induced phase transition in VO2 enables dynamic switching of functions.
    • This switchable multifunctional metasurface offers a promising platform for next-generation terahertz devices.